Merge pull request !4911 from riemann_penn/add_func_type_check_for_switch_layer

Merge pull request !4859 from liuxiao93/Add-ReversSqueuce-EditDistance-CTCGrerdyDecoder

2. fix test_graphdata_distributed.py failing randomly

Merge pull request !4868 from guozhijian/fix_concat_with_zero_dataset

Merge pull request !4789 from liuxiao93/Add-EditDistance-op-for-GE

Merge pull request !4801 from yihuaijie/dev

Merge pull request !4688 from amongo/FixBoolParse

add testcase of st

Merge pull request !4744 from lichen/support_bert

Merge pull request !4782 from islam_amin/bbox_class

Merge pull request !4689 from zhangbuxue/add_check_for_user_define_bprop_in_Pynative_mode

implment pause in MapOp, added more to callback

add ds_callback

- Initial drop of Python DSCallback

- Pybind DSCallback

- Pybind DSCallback

added callback to mapOp

- de_pipeline DSCallback

- de_pipeline DSCallback

add test case, segfault for now

fix seg fault

- de_pipeline DSCallback

remove 1 line

update callback test case, now works

use builder class for mapOp callback

- de_pipeline DSCallback

- de_pipeline DSCallback

- de_pipeline DSCallback

better test case

minor fix

add comments and minor clean ups

get rid of nullptr in MapOp, use other flag instead

fix a bug ParseMapOp only takes 1 callback

- Added WaitedDSCalabck

refactor callback param

fix text case incorrect number

- added testing

fix cpp test case

- added testing

- revert back lenet changes

- cleanup test_callbacks.py

- cleanup test_callbacks.py

fix CI stage I

fix CI stage II

fix CI and update epoch counter

- add validation
- add more testing  test_callbacks.py

use random data op to do tests

adjust when to call EpochBegin/End

- add repeat with callback

- addressing reviewers' comments

- docstring and CI fixes

- docstring and CI fixes

- docstring and CI fixes

- rebase with upstream/master

fix cpp test case

fix review comments

addr review cmts, add test case

Merge pull request !4722 from lijiaqi/modify_error_type

Merge pull request !4498 from heleiwang/gnn_distributed

Merge pull request !4723 from yangzhenzhang/concat-more-than-3-tensors

Merge pull request !4701 from guozhijian/fix_concat_get_dataset_size_err

try to display image

Merge pull request !4425 from fary86/fix_if_no_return_coredump

Merge pull request !4650 from yangzhenzhang/embedding-lookup-auto-parallel

Merge pull request !4367 from MahdiRahmaniHanzaki/cutmix

Merge pull request !4598 from zhangbuxue/support_axis_is_None_for_all_and_any_in_graph_mode

Merge pull request !2948 from amongo/FixControlFlow

add join for ref

adjust env eliminate to eliminate all env ops

add partial app cache

resolve while endless

fix env eliminate

support for "for while" cases

fix join shape error